Battery charger



FIG. 1 is a top plan view of a battery charger showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left elevation view thereof;

FIG. 6 is a right elevation view thereof; and,

FIG. 7 is a front, top, right isometric view thereof.

The dashed lines indicate unclaimed subject matter by outline. 

The ornamental design for a battery charger, as shown and described. 